import { type ClassValue, clsx } from "clsx";
import { twMerge } from "tailwind-merge";
import { OverlaySettings } from "./types";

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

export function generateOverlayCSS(settings: OverlaySettings): string {
  // Convert backgroundOpacity (0-1) to hex alpha if needed, or use rgba
  // Here we assume CSS Injection will be used as a <style> tag or returned by API

  const r = parseInt(settings.backgroundColor.slice(1, 3), 16);
  const g = parseInt(settings.backgroundColor.slice(3, 5), 16);
  const b = parseInt(settings.backgroundColor.slice(5, 7), 16);
  const rgbaBackground = `rgba(${r}, ${g}, ${b}, ${settings.backgroundOpacity})`;

  return `
    :root {
      --chat-font-family: ${settings.fontFamily};
      --chat-font-size: ${settings.fontSize};
      --chat-text-color: ${settings.textColor};
      --chat-bg-color: ${rgbaBackground};
      --chat-text-shadow: ${settings.textShadow};
      --chat-spacing: ${settings.messageSpacing};
    }

    body {
      background-color: transparent;
      margin: 0;
      padding: 0;
      overflow: hidden;
      font-family: var(--chat-font-family);
    }

    .chat-container {
      width: 100%;
      height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      padding: 1rem;
      box-sizing: border-box;
    }

    .chat-message {
      background-color: var(--chat-bg-color);
      color: var(--chat-text-color);
      text-shadow: var(--chat-text-shadow);
      font-size: var(--chat-font-size);
      margin-bottom: var(--chat-spacing);
      padding: 0.5rem;
      border-radius: 4px;
      word-wrap: break-word;
      animation: fadeIn 0.2s ease-out;
    }

    .username {
      font-weight: bold;
      margin-right: 0.5rem;
    }

    .badges {
      display: ${settings.showBadges ? 'inline-flex' : 'none'};
      margin-right: 0.25rem;
      vertical-align: middle;
      gap: 0.25rem;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(10px); }
      to { opacity: 1; transform: translateY(0); }
    }
  `;
}